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Generified UiMarkdownParser by adding abstract UiParser

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Ell 2022-09-04 12:26:55 +02:00
parent 963ea557e8
commit 2d3d93c610
3 changed files with 256 additions and 213 deletions
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1
CHANGELOG.md
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@ -31,6 +31,7 @@ Additions
Improvements
- Allow elements to auto-adjust their size even when their children are aligned oddly
- Close other dropdowns when opening a dropdown
- Generified UiMarkdownParser by adding abstract UiParser
Fixes
- Fixed parents of elements that prevent spill not being notified properly

222
MLEM.Ui/Parsers/UiMarkdownParser.cs
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@ -1,20 +1,12 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Text.RegularExpressions;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Formatting;
using MLEM.Misc;
using MLEM.Textures;
using MLEM.Ui.Elements;
using MLEM.Ui.Style;
namespace MLEM.Ui.Parsers {
/// <summary>
/// A class for parsing Markdown strings into a set of MLEM.Ui elements with styling for each individual <see cref="ElementType"/>.
/// To parse, use <see cref="Parse"/> or <see cref="ParseInto"/>. To style the parsed output, use <see cref="Style{T}"/> before parsing.
/// A class for parsing Markdown strings into a set of MLEM.Ui elements with styling for each individual <see cref="UiParser.ElementType"/>.
/// To parse, use <see cref="UiParser.Parse"/> or <see cref="UiParser.ParseInto"/>. To style the parsed output, use <see cref="UiParser.Style{T}"/> before parsing.
/// </summary>
/// <remarks>
/// Note that this parser is rather rudimentary and doesn't deal well with very complex Markdown documents. Missing features are as follows:
@ -25,106 +17,18 @@ namespace MLEM.Ui.Parsers {
/// <item><description>Tables</description></item>
/// </list>
/// </remarks>
public class UiMarkdownParser {
private static readonly ElementType[] ElementTypes = EnumHelper.GetValues<ElementType>();
/// <summary>
/// The base path for markdown images, which is prepended to the image link.
/// </summary>
public string ImageBasePath;
/// <summary>
/// An action that is invoked when an image fails to load while parsing.
/// This action receives the expected location of the image, as well as the <see cref="Exception"/> that occured.
/// </summary>
public Action<string, Exception> ImageExceptionHandler;
/// <summary>
/// The graphics device that should be used when loading images and other graphics-dependent content.
/// </summary>
public GraphicsDevice GraphicsDevice;
/// <summary>
/// The name of the font used for inline code as well as code blocks.
/// This only has an effect if a font with this name is added to the used <see cref="UiStyle"/>'s <see cref="UiStyle.AdditionalFonts"/>.
/// This defaults to "Monospaced" if default styling is applied in <see cref="UiMarkdownParser(bool)"/>.
/// </summary>
public string CodeFont;
private readonly Dictionary<ElementType, Action<Element>> elementStyles = new Dictionary<ElementType, Action<Element>>();
public class UiMarkdownParser : UiParser {
/// <summary>
/// Creates a new UI markdown parser and optionally initializes some default style settings.
/// </summary>
/// <param name="applyDefaultStyling">Whether default style settings should be applied.</param>
public UiMarkdownParser(bool applyDefaultStyling = true) {
if (applyDefaultStyling) {
this.CodeFont = "Monospaced";
this.Style<VerticalSpace>(ElementType.VerticalSpace, v => v.Size = new Vector2(1, 5));
for (var i = 0; i < 6; i++) {
var level = i;
this.Style<Paragraph>(UiMarkdownParser.ElementTypes[Array.IndexOf(UiMarkdownParser.ElementTypes, ElementType.Header1) + i], p => {
p.Alignment = TextAlignment.Center;
p.TextScaleMultiplier = 2 - level * 0.15F;
});
}
}
}
public UiMarkdownParser(bool applyDefaultStyling = true) : base(applyDefaultStyling) {}
/// <summary>
/// Parses the given markdown string into a set of elements (using <see cref="Parse"/>) and adds them as children to the givem <paramref name="element"/>.
/// During this process, the element stylings specified using <see cref="Style{T}"/> are also applied.
/// </summary>
/// <param name="markdown">The markdown to parse.</param>
/// <param name="element">The element to add the parsed elements to.</param>
/// <returns>The <paramref name="element"/>, for chaining.</returns>
public Element ParseInto(string markdown, Element element) {
foreach (var (_, e) in this.Parse(markdown))
element.AddChild(e);
return element;
}
/// <summary>
/// Parses the given markdown string into a set of elements and returns them along with their <see cref="ElementType"/>.
/// During this process, the element stylings specified using <see cref="Style{T}"/> are also applied.
/// </summary>
/// <param name="markdown">The markdown to parse.</param>
/// <returns>The parsed elements.</returns>
public IEnumerable<(ElementType, Element)> Parse(string markdown) {
foreach (var (t, e) in this.ParseUnstyled(markdown)) {
if (this.elementStyles.TryGetValue(t, out var style))
style.Invoke(e);
yield return (t, e);
}
}
/// <summary>
/// Specifies an action to be invoked when a new element with the given <see cref="ElementType"/> is parsed in <see cref="Parse"/> or <see cref="ParseInto"/>.
/// These actions can be used to modify the style properties of the created elements.
/// </summary>
/// <param name="types">The element types that should be styled. Can be a combined flag.</param>
/// <param name="style">The action that styles the elements with the given element type.</param>
/// <param name="add">Whether the <paramref name="style"/> function should be added to the existing style settings, or replace them.</param>
/// <typeparam name="T">The type of elements that the given <see cref="ElementType"/> flags are expected to be.</typeparam>
/// <returns>This parser, for chaining.</returns>
public UiMarkdownParser Style<T>(ElementType types, Action<T> style, bool add = false) where T : Element {
foreach (var type in UiMarkdownParser.ElementTypes) {
if (types.HasFlag(type)) {
if (add && this.elementStyles.ContainsKey(type)) {
this.elementStyles[type] += Action;
} else {
this.elementStyles[type] = Action;
}
}
}
return this;
void Action(Element e) {
style.Invoke(e as T ?? throw new ArgumentException($"Expected {typeof(T)} for style action but got {e.GetType()}"));
}
}
private IEnumerable<(ElementType, Element)> ParseUnstyled(string markdown) {
/// <inheritdoc />
protected override IEnumerable<(ElementType, Element)> ParseUnstyled(string raw) {
var inCodeBlock = false;
foreach (var line in markdown.Split('\n')) {
foreach (var line in raw.Split('\n')) {
// code blocks
if (line.Trim().StartsWith("```")) {
inCodeBlock = !inCodeBlock;
@ -151,45 +55,7 @@ namespace MLEM.Ui.Parsers {
// images
var imageMatch = Regex.Match(line, @"!\[\]\(([^)]+)\)");
if (imageMatch.Success) {
if (this.GraphicsDevice == null)
throw new NullReferenceException("A markdown parser requires a GraphicsDevice for parsing images");
TextureRegion image = null;
LoadImageAsync();
yield return (ElementType.Image, new Image(Anchor.AutoLeft, new Vector2(1, -1), _ => image) {
OnDisposed = e => image?.Texture.Dispose()
});
async void LoadImageAsync() {
var loc = imageMatch.Groups[1].Value;
// only apply the base path for relative files
if (this.ImageBasePath != null && !loc.StartsWith("http") && !Path.IsPathRooted(loc))
loc = $"{this.ImageBasePath}/{loc}";
try {
Texture2D tex;
if (loc.StartsWith("http")) {
using (var client = new HttpClient()) {
using (var src = await client.GetStreamAsync(loc)) {
using (var memory = new MemoryStream()) {
// download the full stream before passing it to texture
await src.CopyToAsync(memory);
tex = Texture2D.FromStream(this.GraphicsDevice, memory);
}
}
}
} else {
using (var stream = Path.IsPathRooted(loc) ? File.OpenRead(loc) : TitleContainer.OpenStream(loc))
tex = Texture2D.FromStream(this.GraphicsDevice, stream);
}
image = new TextureRegion(tex);
} catch (Exception e) {
if (this.ImageExceptionHandler != null) {
this.ImageExceptionHandler.Invoke(loc, e);
} else {
throw new Exception($"Couldn't parse image {loc}, and no ImageExceptionHandler was set", e);
}
}
}
yield return (ElementType.Image, this.ParseImage(imageMatch.Groups[1].Value));
continue;
}
@ -197,7 +63,7 @@ namespace MLEM.Ui.Parsers {
var parsedHeader = false;
for (var h = 6; h >= 1; h--) {
if (line.StartsWith(new string('#', h))) {
var type = UiMarkdownParser.ElementTypes[Array.IndexOf(UiMarkdownParser.ElementTypes, ElementType.Header1) + h - 1];
var type = UiParser.ElementTypes[Array.IndexOf(UiParser.ElementTypes, ElementType.Header1) + h - 1];
yield return (type, new Paragraph(Anchor.AutoLeft, 1, this.ParseParagraph(line.Substring(h).Trim())));
parsedHeader = true;
break;
@ -226,75 +92,5 @@ namespace MLEM.Ui.Parsers {
return par;
}
/// <summary>
/// A flags enumeration used by <see cref="UiMarkdownParser"/> that contains the types of elements that can be parsed and returned in <see cref="Parse"/> or <see cref="UiMarkdownParser.ParseInto"/>.
/// This is a flags enumeration so that <see cref="UiMarkdownParser.Style{T}"/> can have multiple element types being styled at the same time.
/// </summary>
[Flags]
public enum ElementType {
/// <summary>
/// A blockquote.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Blockquote = 1,
/// <summary>
/// A vertical space, which is a gap between multiple markdown paragraphs.
/// This element type is a <see cref="VerticalSpace"/>.
/// </summary>
VerticalSpace = 2,
/// <summary>
/// An image.
/// This element type is an <see cref="Image"/>.
/// </summary>
Image = 4,
/// <summary>
/// A header with header level 1.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header1 = 8,
/// <summary>
/// A header with header level 2.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header2 = 16,
/// <summary>
/// A header with header level 3.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header3 = 32,
/// <summary>
/// A header with header level 4.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header4 = 64,
/// <summary>
/// A header with header level 5.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header5 = 128,
/// <summary>
/// A header with header level 6.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header6 = 256,
/// <summary>
/// A combined flag that contains <see cref="Header1"/> through <see cref="Header6"/>.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Headers = ElementType.Header1 | ElementType.Header2 | ElementType.Header3 | ElementType.Header4 | ElementType.Header5 | ElementType.Header6,
/// <summary>
/// A paragraph, which is one line of markdown text.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Paragraph = 512,
/// <summary>
/// A single line of a code block.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
CodeBlock = 1024
}
}
}

246
MLEM.Ui/Parsers/UiParser.cs Normal file
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@ -0,0 +1,246 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Formatting;
using MLEM.Misc;
using MLEM.Textures;
using MLEM.Ui.Elements;
using MLEM.Ui.Style;
namespace MLEM.Ui.Parsers {
/// <summary>
/// A base class for parsing various types of formatted strings into a set of MLEM.Ui elements with styling for each individual <see cref="ElementType"/>.
/// The only parser currently implemented is <see cref="UiMarkdownParser"/>.
/// </summary>
public abstract class UiParser {
/// <summary>
/// An array containing all of the <see cref="ElementType"/> enum values.
/// </summary>
public static readonly ElementType[] ElementTypes = EnumHelper.GetValues<ElementType>();
/// <summary>
/// The base path for images, which is prepended to the image link.
/// </summary>
public string ImageBasePath;
/// <summary>
/// An action that is invoked when an image fails to load while parsing.
/// This action receives the expected location of the image, as well as the <see cref="Exception"/> that occured.
/// </summary>
public Action<string, Exception> ImageExceptionHandler;
/// <summary>
/// The graphics device that should be used when loading images and other graphics-dependent content.
/// </summary>
public GraphicsDevice GraphicsDevice;
/// <summary>
/// The name of the font used for inline code as well as code blocks.
/// This only has an effect if a font with this name is added to the used <see cref="UiStyle"/>'s <see cref="UiStyle.AdditionalFonts"/>.
/// This defaults to "Monospaced" if default styling is applied in <see cref="UiParser(bool)"/>.
/// </summary>
public string CodeFont;
private readonly Dictionary<ElementType, Action<Element>> elementStyles = new Dictionary<ElementType, Action<Element>>();
/// <summary>
/// Creates a new UI parser and optionally initializes some default style settings.
/// </summary>
/// <param name="applyDefaultStyling">Whether default style settings should be applied.</param>
protected UiParser(bool applyDefaultStyling) {
if (applyDefaultStyling) {
this.CodeFont = "Monospaced";
this.Style<VerticalSpace>(ElementType.VerticalSpace, v => v.Size = new Vector2(1, 5));
for (var i = 0; i < 6; i++) {
var level = i;
this.Style<Paragraph>(UiParser.ElementTypes[Array.IndexOf(UiParser.ElementTypes, UiParser.ElementType.Header1) + i], p => {
p.Alignment = TextAlignment.Center;
p.TextScaleMultiplier = 2 - level * 0.15F;
});
}
}
}
/// <summary>
/// Parses the given raw formatted string into a set of elements and returns them along with their <see cref="ElementType"/>.
/// This method is used by implementors to parse specific text, and it is used by <see cref="Parse"/> and <see cref="ParseInto"/>.
/// </summary>
/// <param name="raw">The raw string to parse.</param>
/// <returns>The parsed elements, without styling.</returns>
protected abstract IEnumerable<(ElementType, Element)> ParseUnstyled(string raw);
/// <summary>
/// Parses the given raw formatted string into a set of elements and returns them along with their <see cref="ElementType"/>.
/// During this process, the element stylings specified using <see cref="Style{T}"/> are also applied.
/// </summary>
/// <param name="raw">The raw string to parse.</param>
/// <returns>The parsed elements.</returns>
public IEnumerable<(ElementType, Element)> Parse(string raw) {
foreach (var (t, e) in this.ParseUnstyled(raw)) {
if (this.elementStyles.TryGetValue(t, out var style))
style.Invoke(e);
yield return (t, e);
}
}
/// <summary>
/// Parses the given raw formatted string into a set of elements (using <see cref="Parse"/>) and adds them as children to the givem <paramref name="element"/>.
/// During this process, the element stylings specified using <see cref="Style{T}"/> are also applied.
/// </summary>
/// <param name="raw">The raw string to parse.</param>
/// <param name="element">The element to add the parsed elements to.</param>
/// <returns>The <paramref name="element"/>, for chaining.</returns>
public Element ParseInto(string raw, Element element) {
foreach (var (_, e) in this.Parse(raw))
element.AddChild(e);
return element;
}
/// <summary>
/// Specifies an action to be invoked when a new element with the given <see cref="ElementType"/> is parsed in <see cref="Parse"/> or <see cref="ParseInto"/>.
/// These actions can be used to modify the style properties of the created elements.
/// </summary>
/// <param name="types">The element types that should be styled. Can be a combined flag.</param>
/// <param name="style">The action that styles the elements with the given element type.</param>
/// <param name="add">Whether the <paramref name="style"/> function should be added to the existing style settings, or replace them.</param>
/// <typeparam name="T">The type of elements that the given <see cref="ElementType"/> flags are expected to be.</typeparam>
/// <returns>This parser, for chaining.</returns>
public UiParser Style<T>(ElementType types, Action<T> style, bool add = false) where T : Element {
foreach (var type in UiParser.ElementTypes) {
if (types.HasFlag(type)) {
if (add && this.elementStyles.ContainsKey(type)) {
this.elementStyles[type] += Action;
} else {
this.elementStyles[type] = Action;
}
}
}
return this;
void Action(Element e) {
style.Invoke(e as T ?? throw new ArgumentException($"Expected {typeof(T)} for style action but got {e.GetType()}"));
}
}
/// <summary>
/// Parses the given path into a <see cref="Image"/> element by loading it from disk or downloading it from the internet.
/// Note that, for a <paramref name="path"/> that doesn't start with <c>http</c> and isn't rooted, the <see cref="ImageBasePath"/> is prepended automatically.
/// This method invokes an asynchronouns action, meaning the <see cref="Image"/>'s <see cref="Image.Texture"/> will likely not have loaded in when this method returns.
/// </summary>
/// <param name="path">The absolute, relative or web path to the image.</param>
/// <returns>The loaded image.</returns>
/// <exception cref="NullReferenceException">Thrown if <see cref="GraphicsDevice"/> is null, or if there is an <see cref="Exception"/> loading the image and <see cref="ImageExceptionHandler"/> is unset.</exception>
protected Image ParseImage(string path) {
if (this.GraphicsDevice == null)
throw new NullReferenceException("A UI parser requires a GraphicsDevice for parsing images");
TextureRegion image = null;
LoadImageAsync();
return new Image(Anchor.AutoLeft, new Vector2(1, -1), _ => image) {
OnDisposed = e => image?.Texture.Dispose()
};
async void LoadImageAsync() {
// only apply the base path for relative files
if (this.ImageBasePath != null && !path.StartsWith("http") && !Path.IsPathRooted(path))
path = $"{this.ImageBasePath}/{path}";
try {
Texture2D tex;
if (path.StartsWith("http")) {
using (var client = new HttpClient()) {
using (var src = await client.GetStreamAsync(path)) {
using (var memory = new MemoryStream()) {
// download the full stream before passing it to texture
await src.CopyToAsync(memory);
tex = Texture2D.FromStream(this.GraphicsDevice, memory);
}
}
}
} else {
using (var stream = Path.IsPathRooted(path) ? File.OpenRead(path) : TitleContainer.OpenStream(path))
tex = Texture2D.FromStream(this.GraphicsDevice, stream);
}
image = new TextureRegion(tex);
} catch (Exception e) {
if (this.ImageExceptionHandler != null) {
this.ImageExceptionHandler.Invoke(path, e);
} else {
throw new NullReferenceException($"Couldn't parse image {path}, and no ImageExceptionHandler was set", e);
}
}
}
}
/// <summary>
/// A flags enumeration used by <see cref="UiParser"/> that contains the types of elements that can be parsed and returned in <see cref="Parse"/> or <see cref="ParseInto"/>.
/// This is a flags enumeration so that <see cref="Style{T}"/> can have multiple element types being styled at the same time.
/// </summary>
[Flags]
public enum ElementType {
/// <summary>
/// A blockquote.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Blockquote = 1,
/// <summary>
/// A vertical space, which is a gap between multiple paragraphs.
/// This element type is a <see cref="VerticalSpace"/>.
/// </summary>
VerticalSpace = 2,
/// <summary>
/// An image.
/// This element type is an <see cref="Image"/>.
/// </summary>
Image = 4,
/// <summary>
/// A header with header level 1.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header1 = 8,
/// <summary>
/// A header with header level 2.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header2 = 16,
/// <summary>
/// A header with header level 3.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header3 = 32,
/// <summary>
/// A header with header level 4.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header4 = 64,
/// <summary>
/// A header with header level 5.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header5 = 128,
/// <summary>
/// A header with header level 6.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Header6 = 256,
/// <summary>
/// A combined flag that contains <see cref="Header1"/> through <see cref="Header6"/>.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Headers = ElementType.Header1 | ElementType.Header2 | ElementType.Header3 | ElementType.Header4 | ElementType.Header5 | ElementType.Header6,
/// <summary>
/// A paragraph, which is one line (or non-vertically spaced section) of text.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
Paragraph = 512,
/// <summary>
/// A single line of a code block.
/// This element type is a <see cref="Paragraph"/>.
/// </summary>
CodeBlock = 1024
}
}
}